Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment (Details)

v3.10.0.1
Property and Equipment (Details)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
$ / Boe
Sep. 30, 2017
USD ($)
$ / Boe
Sep. 30, 2018
USD ($)
$ / Boe
Sep. 30, 2017
USD ($)
$ / Boe
Dec. 31, 2017
USD ($)
Oil and gas properties, on the basis of full-cost accounting            
Proved properties   $ 803,841   $ 803,841   $ 765,308
Unproved properties not being amortized   4,505   4,505   7,065
Other property and equipment   6,369   6,369   6,508
Less accumulated depreciation, depletion, amortization and impairment   (251,432)   (251,432)   (204,419)
Net property and equipment   563,283   563,283   $ 574,462
Other information            
Depreciation, depletion, and amortization   15,485 $ 15,170 47,182 $ 46,471  
Reserve-Based Revolving Credit Facility            
Other information            
Repayment of debt       50,000    
Discontinued Operations Disposed Of by Sale            
Other information            
Gain or loss recognized on disposal of oil and gas equipment $ 0          
Proceeds from the sale of oil and gas equipment 58,000          
Net proceeds from the sale of oil and gas equipment $ 54,400          
Oil and Gas            
Other information            
Internal costs capitalized to oil and gas properties   821 1,651 2,638 4,656  
Capitalized qualifying share-based compensation expense   300 800 800 2,000  
Depletion expense   14,913 14,575 45,433 44,695  
Depreciation on other property and equipment   $ 572 $ 595 $ 1,749 $ 1,776  
Depletion expense (per Boe) | $ / Boe   9.01 7.42 8.81 7.29  
Depreciation on other property and equipment (per Boe) | $ / Boe   0.35 0.30 0.34 0.29  
Depreciation, depletion, and amortization (per Boe) | $ / Boe   9.36 7.72 9.15 7.58  
Depreciation, depletion, and amortization   $ 15,485 $ 15,170 $ 47,182 $ 46,471  
Impairment of unproved properties   $ 0 $ 0 0 0  
Oil and Gas | Discontinued Operations Disposed Of by Sale            
Other information            
Gain or loss recognized on disposal of oil and gas equipment       0 0  
Net proceeds from the sale of oil and gas equipment       $ 400 $ 1,400  
Other Property and Equipment | Minimum            
Other information            
Estimated useful lives       2 years    
Other Property and Equipment | Maximum            
Other information            
Estimated useful lives       10 years